<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>border-radius圆角</title>
    <style>
        div {
            float: left;
            width: 300px;
            height: 300px;
            margin: 20px;
            background-color: green;
             /* border-radius:50px/50px; */
            /* border-radius:50%; */
        }
    </style>
</head>

<body>
    <div class="box1"></div>

    <div class="box2"></div>

    <div class="box3"></div>

    <div class="box4"></div>

    <div class="box5"></div>


</body>

</html>